NOTE: Though this is a simple procedure, it is recommended that you backup any/all critical data before continuing.

Download the .zip file and extract it to your system. Note the location where it was saved.

Open your browser and launch the Seagate Business NAS Manager page.  

Provide admin username / password authentication when prompted.  The Seagate Business NAS Manager page opens.

Click on System > Firmware Update in the left column of the NAS Manager page.
 

NOTE: The automatic firmware update options can be set from this page.  Please see Document ID: 005315 for more information on configuring Seagate Business NAS automatic firmware updates.

The Manual Update section is located in the bottom section of the page.

In the IMG: field, click Choose File and browse to the .img file that was previously extracted from the .zip file you downloaded.

In the MD5: field, click Choose File and browse to the .md5 file that was previously extracted from the .zip file you downloaded.

Once both files have been selected, click the Update Now button. 

This may take a few minutes to complete.  During the update process, do not refresh or shut down your browser.

When the firmware update is complete, the Seagate Business NAS will automatically reboot.  After the device’s reboot is finished, the firmware update process is complete.